chore(deps): bump plug from 1.7.2 to 1.8.0

[dependabot-preview]

Bumps plug from 1.7.2 to 1.8.0.

Changelog

Sourced from plug's changelog.

v1.8.0 (2019-03-31)

Enhancements

• [Plug.Conn] Add get_session/1 for retrieving the whole session
• [Plug.CSRFProtection] Add Plug.CSRFPRotection.load_state/2 and Plug.CSRFPRotection.dump_state/0 to allow tokens to be generated in other processes
• [Plug.Parsers] Allow unnamed parts in multipart parser via :include_unnamed_parts_at
• [Plug.Router] Wrap router dispatch in a connection checkpoint to avoid losing information attached to the connection in error cases
• [Plug.Telemetry] Add Plug.Telemetry to facilitate with telemetry integration

Bug fixes

• [Plug.Conn.Status] Use IANA registered status code for HTTP 425
• [Plug.RequestID] Reduce RequestID size by relying on base64 encoding
• [Plug.Static] Ensure etags are quoted correctly
• [Plug.Static] Ensure vary header is set in 304 response
• [Plug.Static] Omit content-encoding header in 304 responses

Commits

• 56fadff Release v1.8.0
• e2b5e7f Add Plug.CSRFPRotection.load_state/dump_state
• ff58e94 Use IANA registered status code for HTTP 425 (#830)
• 5b3df0f Wrap router dispatch in a connection checkpoint
• 0e7a91c Update documentation for session_delete/2 (#828)
• bae5167 Make get_session/1 public
• 2e7ae54 Run formatter
• 8acc8fb Do not set header only to remove it, tidy up docs
• 959338b Omit content-encoding header in 304 responses.
• 803ec79 Ensure vary header is set in 304 response.
• Additional commits viewable in compare view

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[codecov]

Codecov Report

Merging #149 into dev will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##              dev     #149   +/-   ##
=======================================
  Coverage   87.12%   87.12%           
=======================================
  Files         112      112           
  Lines        1359     1359           
=======================================
  Hits         1184     1184           
  Misses        175      175

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